This kmz file shows the extent of coverage for the 2006 FEMA Nueces County, TX lidar
data set.

Spectrum Mapping, LLC was tasked by MAPVI - URS Corporation, Albuquergue, to provide
airborne Light Detection and Ranging (Lidar) of approximately 620 square miles around
Nueces County, Texas. MAPVI (Mapping Alliance Partnership VI for FEMA Region IV) is
a joint venture of URS Corporation, Greenhorne & O'Mara and Spectrum Mapping. Spectrum
followed data collection and processing procedures for Federal Emergency Management
Agency (FEMA) Guidelines and Specifications Appendix A. Data product deliverables
included Lidar to support 2 foot contours. Spectrum's acquisition division collected
the Lidar data on June 19, 22-25, 27, 28 and July 16 and 17, 2006. The project was
collected with a Rams ALS50 Lidar sensor, including an inertial measurement unit (IMU)
and a dual frequency Global Positioning System (GPS) receiver and antenna. Upon receipt
of this data, the NOAA Coastal Serices Center reclassified all non-ground data to
a classification of 1 (Unclassified) and all ground points to a classification of
2 (Ground).

DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce

Point of Contact

Federal Emergency Management Agency (FEMA), Region VI940-898-5165

Associated Resources

Lidar Dataset Supplemental Information

Originator

DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce

Originator

Federal Emergency Management Agency (FEMA)

Publisher

DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce

Date(s)

publication: 2006-12-21

Data Presentation Form:

Digital image

Dataset Progress Status

Complete

Data Update Frequency:

Not planned

Purpose:

This LIDAR operation was designed to provide a high density set of masspoints within
the defined areas. The data sets are suitable for the development of contours for
use in hydraulic/hydrologic model development, and for assessing environmental impacts.
Typical uses for the data set include: FEMA Flood Plain Map Modernization, DFIRM map
updates, watersheds and other hydro studies per FEMA specifications, county mapping
projects, and flood mitigation assessment.

Use Limitations

These data depict the elevations at the time of the survey and are only accurate for
that time. Users should be aware that temporal changes may have occurred
since this data set was collected and some parts of this data may no longer represent
actual surface conditions. Users should not use this data for critical
applications without a full awareness of its limitations. Any conclusions drawn
from analysis of this information are not the responsibility of NOAA or any of its
partners. These data are NOT to be used for navigational purposes.

Time Period:

2006-06-22 2006-06-27 2006-07-16 to 2006-06-25 2006-06-28 2006-07-17

Spatial Reference System:

urn:ogc:def:crs:EPSG::4269 Ellipsoid in Meters

Spatial Bounding Box Coordinates:

N: 28.016539

S: 27.556339

E: -97.041570

W: -97.944170

Spatial Coverage Map:

Themes

Bathymetry/Topography

Land Surface

Topography

Digital Terrain Model

Elevation Data

LIDAR

Breaklines

Contours

DEM

Flow vectors

Places

United States

Texas

Nueces County

Use Constraints

No constraint information available

Fees

Fee information not available.

Lineage Statement

Lineage statement not available.

Processor

Spectrum Mapping, LLC

DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce

The NOAA Coastal Services Center (CSC) received the files in las format. The files
contained Lidar elevation and intensity measurements. The data was in Texas State
Plane coordinates - South (FIPS Zone 4205), NAD83 and NAVD88 Geoid 03 vertical datum
and US Survey Feet. CSC performed the following processing to the data to make it
available within the Digital Coast: 1. The data were converted from Texas State Plane
coordinates to geographic coordinates. 2. The data were converted from NAVD88 (orthometric)
heights to GRS80 (ellipsoid) heights using Geoid 03. 3. The data were converted from
US Survey feet to meters. 4. The LAS data were sorted by latitude and the headers
were updated. 5. All non-ground data reclassified to a classification of 1 (Unclassified)
and all ground points reclassified to a classification of 2 (Ground).

The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are
currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS
or LAZ format. The LAS format is an industry standard for LiDAR data developed by
the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless
compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The
data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data
are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for
the ability to apply the most up to date geoid model when transforming to orthometric
heights.